What to do when you give a guy you like your number and they haven't texted you yet?

3 days ago I gave my crush who is also a co worker my number out of nowhere. I don't usually do stuff like this but I really really like him so I figured why not I have nothing to loose. Well I thought his reaction was good because he was really smiley but I could tell he was shocked. All signs were good before, I thought he might have liked me as Well but I haven't heard anything yet and it's worrying me. Ran into him yesterday and it was kind of awkward but everything seemed fine. I just don't know what to do. Should I ask him about it? Or just move on? Give up? I don't have a lot of experience with men so I'm not sure what to do.